Well, I just called Castle and they said no. Something to do with the fact that they have a flat repair fee, and dishonest people may later send in their discounted V1 to be replaced with a V2 ESC for cheap. Still, I think they could mark such ESCs somehow so V1's could be differentiated from V2's - maybe some etching on the PCB itself.
Don't buy it as they could do something very simple - like trim 1 corner fin by 2mm...
No gripes here just a very satisfied MMM V2 owner.This is my newest project a Cen Matrix Pro with the Monster Mamba Max Neu/1512/1.5D/F 3s 6000.Its freakin realy fast.I also want to thank Mike from RCM for the help with the battery tray and ofcourse the sweet machined motormount.